Cummins QSB3.9-G35 vs Deutz BF6L913
The Cummins QSB3.9-G35 and Deutz BF6L913 are both diesel generator engines in a similar power class. Both are rated at roughly 79 kVA. Displacement is 3.9 L versus 6.128 L. The table below compares their full specifications side by side.
| Specification | Cummins QSB3.9-G35 | Deutz BF6L913 |
|---|---|---|
| Headline rating | 79 kVA | 78 kVA |
| Standby (50 Hz) | 63 kWe | 62.1 kWe |
| Prime (50 Hz) | 50 kWe | 58.5 kWe |
| Standby (60 Hz) | — | 73.8 kWe |
| Prime (60 Hz) | — | 70.2 kWe |
| Displacement | 3.9 L | 6.128 L |
| Configuration | L4 | L6 |
| Cylinders | 4 | 6 |
| Rated speed | 1,500 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Air-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | China | Germany |
Choosing between Cummins QSB3.9-G35 and Deutz BF6L913
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The Cummins QSB3.9-G35 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.